CN215565783U

CN215565783U - Centralizing casing coupling

Info

Publication number: CN215565783U
Application number: CN202121506383.1U
Authority: CN
Inventors: 孙西宁; 刘东生; 吕新明; 许兵; 孙合平
Original assignee: Hebei Shangshan Petroleum Machinery Co ltd
Current assignee: Hebei Shangshan Petroleum Machinery Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2022-01-18
Anticipated expiration: 2031-07-02

Abstract

The utility model provides a centralizing casing coupling, which belongs to the technical field of petroleum mechanical equipment and comprises a coupling body and a plurality of spring pieces; the coupling body is used for connecting two adjacent sleeves, a plurality of mounting grooves are formed in the outer side wall of the coupling body, the length direction of the mounting grooves is consistent with that of the coupling body, and the mounting grooves are arranged in the circumferential direction of the outer side wall of the coupling body at intervals; a plurality of spring pieces correspond respectively and install in a plurality of mounting grooves, and a plurality of spring pieces are bow-shaped, and the front end fixed connection of spring piece is in the mounting groove, and the rear end laminating of spring piece just slides along the length direction of mounting groove in the bottom surface of mounting groove. According to the centralizing casing coupling provided by the utility model, the plurality of spring pieces with centralizing effect are radially arranged on the outer side of the coupling body, so that the problem of casing descending obstruction caused by a rigid centralizer is solved; and the problems that the centralizer moves and later perforation construction is influenced due to unstable fixation of the stop ring and the like are avoided, and the centralizing effect is improved.

Description

Centralizing casing coupling

Technical Field

The utility model belongs to the technical field of petroleum machinery equipment, and particularly relates to a centralizing casing coupling.

Background

Along with the continuous progress of the development technology of oil and gas wells, highly deviated wells and horizontal wells are applied more and more, particularly shale oil and gas development wells are more and more in recent years, when shale oil and gas well completion operation represented by Sichuan basin is performed, as most oil and gas producing layers are the highly deviated wells or horizontal well bores, the well cementation difficulty is very high, and in order to improve the well cementation quality, a casing centralizer is required to be used to ensure the centering degree of a casing string in the well bore when the casing is put down.

In the casing under the highly deviated well or the horizontal well, the rigid centralizer can play a better role in centralizing the casing, but the rigid centralizer has overlarge outer diameter size, has no elasticity and can not be contracted, and the friction in the highly deviated well or the horizontal well is too large, particularly when the well wall has the reduced diameter, the rigid centralizer is often resisted, so that the casing cannot be smoothly put into place. The outer diameter of the elastic centralizer can be expanded and contracted, and the elastic centralizer can reduce the well section to a certain extent. However, when construction is carried out in a shale oil and gas well, a conventional centralizer needs to be fixed on a casing by a stop ring, and due to the fact that the annular space is small, the force borne by the centralizer is large, the stop ring frequently moves, the position of the centralizer changes, and therefore the problem that perforation is carried out on the centralizer frequently occurs during later perforation construction, and construction quality is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a centralizing casing coupling, and aims to solve the problems that the centralizing effect of the existing centralizer is not ideal, and the centralizer is easy to displace to influence construction.

In order to achieve the purpose, the utility model adopts the technical scheme that: providing a centralizing casing coupling comprising:

the coupling body is used for connecting two adjacent sleeves, a plurality of mounting grooves are formed in the coupling body, the length direction of the mounting grooves is consistent with that of the coupling body, and the mounting grooves are arranged in the circumferential direction of the outer side wall of the coupling body at intervals;

the spring leaf is correspondingly installed in a plurality of the mounting groove respectively, the spring leaf is bow-shaped, the front end fixed connection of spring leaf is in the mounting groove, the rear end laminating of spring leaf is in the bottom surface of mounting groove and along the length direction of mounting groove slides.

As another embodiment of the present application, the mounting groove is a rectangular groove.

As another embodiment of the present application, the depth of the mounting groove is greater than the thickness of the spring plate.

As another embodiment of the present application, the length of the mounting groove is greater than the length of the spring plate.

As another embodiment of the present application, the front end of the installation groove is located at the middle of the coupling body.

As another embodiment of the present application, the mounting groove extends to a rear end face of the coupling body.

As another embodiment of the application, a counter bore is formed in the front end of the spring piece, and a countersunk screw used for positioning the spring piece on the mounting groove penetrates through the counter bore.

As another embodiment of the present application, the spring plate is a single arcuate spring plate.

As another embodiment of the application, a circulation groove arranged in parallel with the installation grooves is formed between every two adjacent installation grooves.

As another embodiment of the present application, the flow-through channel is a rectangular channel.

The centralizing casing coupling provided by the utility model has the beneficial effects that: compared with the prior art, the casing centering coupling is provided with the plurality of spring pieces with the centering function in a radial manner on the outer side of the coupling body, so that the problem that the casing is prevented from running due to the fact that the rigid centering device has no elasticity and cannot be contracted is solved; the spring piece is fixed on the coupling body, the stop ring is not needed to assist in centering, the problems that the centering device moves and later-stage perforation construction is influenced due to unstable fixation of the stop ring are solved, and the centering effect is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a centralizing casing collar according to a first embodiment of the utility model;

FIG. 2 is a side view of a centralizing casing collar provided in accordance with a first embodiment of the present invention;

FIG. 3 is a structural schematic diagram of a centralizing casing collar in a pressurized state according to a first embodiment of the utility model;

FIG. 4 is a schematic diagram of a centralizing casing collar provided in accordance with a second embodiment of the utility model;

figure 5 is a side view of a centralizing casing collar provided in accordance with a second embodiment of the present invention.

In the figure: 1. a coupling body; 2. mounting grooves; 3. a spring plate; 4. countersunk head screws; 5. and (4) a circulating groove.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to figures 1 to 3, a centralizing casing collar in accordance with the present invention will now be described. The centralizing casing coupling comprises a coupling body 1 and a plurality of spring pieces 3; the coupling body 1 is used for connecting two adjacent sleeves, a plurality of mounting grooves 2 are formed in the outer side wall of the coupling body 1, the length direction of each mounting groove 2 is consistent with that of the coupling body 1, and the mounting grooves 2 are distributed in the circumferential direction of the outer side wall of the coupling body 1 at intervals; a plurality of spring pieces 3 correspond respectively and install in a plurality of mounting grooves 2, and a plurality of spring pieces 3 are bow-shaped, and the front end fixed connection of spring piece 3 is in mounting groove 2, and the rear end laminating of spring piece 3 slides in the bottom surface of mounting groove 2 and along the length direction of mounting groove 2.

Compared with the prior art, the centralizing casing coupling provided by the utility model has the advantages that the coupling body 1 of the casing is provided with the mounting grooves 2 for mounting the spring pieces 3, the mounting grooves 2 are arranged along the length direction of the coupling body 1, the mounting grooves 2 are radially distributed on the outer side wall of the coupling body 1, two adjacent mounting grooves 2 are arranged at intervals, and the distance and the angle between two adjacent mounting grooves 2 are consistent; an arched spring piece 3 for centering the sleeve is arranged in the mounting groove 2, the front end of the arched spring piece 3 is fixedly connected with the front end of the mounting groove 2, the rear end of the spring piece 3 is attached to the bottom surface of the mounting groove 2 to slide, and the arch body of the arched spring piece 3 faces the outer side of the coupling body 1; when the spring piece 3 is pressed from outside to inside, the rear end of the spring piece 3 is attached to the bottom surface of the mounting groove 2 and slides backwards, and the sleeve is located at the central position in the borehole by the elasticity of the spring piece 3.

According to the centralizing casing coupling provided by the utility model, the plurality of spring pieces 3 with centralizing effect are radially arranged on the outer side of the coupling body 1, so that the problem that the casing is prevented from running down due to the fact that a rigid centralizer has no elasticity and cannot be contracted is solved; the spring piece 3 is fixed on the coupling body 1, and the centering is assisted without a stop ring, so that the problems that the centering device moves and later-stage perforation construction is influenced due to unstable fixation of the stop ring are solved, and the centering effect is improved.

Optionally, six mounting grooves 2 have been seted up on the lateral wall of coupling body 1, and six even intervals are arranged in a week of coupling body 1.

In some embodiments, the mounting groove 2 may adopt the structure shown in fig. 1 and 2. Referring to fig. 1 and 2, the mounting groove 2 is a rectangular groove. The spring leaf 3 is fixed in the mounting groove 2, and the front end of spring leaf 3 is fixed on the bottom surface of mounting groove 2, and the rear end laminating mounting groove 2's of spring leaf 3 bottom surface just can follow the length direction slip of mounting groove 2. As shown in figure 1, the spring piece 3 is a bow spring with the same width in the front and back, the mounting groove 2 where the spring piece 3 is located is a rectangular groove, the width of the rectangular groove is consistent with that of the spring piece 3, and the spring piece 3 is attached to the bottom surface and the inner side wall of the rectangular groove to slide.

Specifically, the depth of the mounting groove 2 is larger than the thickness of the spring piece 3. The spring piece 3 is located the inside of mounting groove 2, and when the spring piece 3 atress, the bottom surface of the rear end laminating mounting groove 2 of spring piece 3 slides. The smaller the inner diameter of the borehole, the more the spring plate 3 is stressed, and the larger the deformation amount of the spring plate 3 is. As shown in fig. 3, when the deformation amount of the spring plate 3 reaches the maximum, the inner diameter of the well hole is equal to the outer diameter of the coupling, the outer side wall of the coupling is attached to the inner wall of the well hole, at this time, the spring plate 3 is completely retracted into the mounting groove 2, the spring plate 3 cannot increase the outer diameter of the coupling, the coupling body 1 is prevented from being smoothly lowered due to the overlarge outer diameter, and the abrasion of the well hole to the spring plate 3 is reduced.

Specifically, the length of the mounting groove 2 is greater than that of the spring piece 3. The mounting groove 2 is formed in the outer side wall of the coupling body 1, the length of the mounting groove 2 is larger than that of the spring piece 3, the spring piece 3 which is deformed under stress can be completely accommodated in the mounting groove 2, and therefore the casing coupling is prevented from being enlarged in outer diameter and being incapable of being smoothly put into the casing due to the fact that the spring piece 3 cannot be completely contracted into the mounting groove 2.

It should be noted that the mounting groove 2 is provided on the outer side wall of the coupling body 1, the mounting groove 2 is provided at the middle part of the coupling body 1, and the front end of the mounting groove 2 is prevented from being arranged on the front end face of the coupling body 1. In-process of going into the well under the sleeve pipe, coupling body 1 cover is established between two adjacent sleeve pipes for connect with two adjacent sleeve pipes of fixed, and coupling body 1's external diameter is greater than sheathed tube external diameter, and the front end of mounting groove 2 avoids extending to coupling body 1's preceding terminal surface, can prevent to go into the in-process under the sleeve pipe, because of reasons such as the pipe wall is uneven and destroy the spring leaf 3 of mounting groove 2 front end.

Optionally, the middle part at coupling body 1 is seted up to mounting groove 2, and the front end and the rear end of mounting groove 2 are the closure state, and the degree of depth of mounting groove 2 is greater than the thickness of spring leaf 3, and at the in-process of casing underrun well, spring leaf 3 atress, the rear end of spring leaf 3 slides backward along the length direction of mounting groove 2, and the bow back radian of spring leaf 3 diminishes, and spring leaf 3 wholly laminates to mounting groove 2 in, even completely contracts to mounting groove 2 in. When the inner diameter of the borehole is smaller, the installation groove 2 can protect the spring piece 3 from being damaged by the inner wall of the borehole.

Optionally, the mounting groove 2 is formed in the rear portion of the coupling body 1, and the rear end of the mounting groove 2 extends to the rear end face of the coupling body 1. Spring leaf 3 receives external pressure to laminating in mounting groove 2, completely contracts to mounting groove 2 even in, and the rear end of spring leaf 3 is located mounting groove 2 rear portion or stretches out outside mounting groove 2, and when the installation of the spring leaf 3 of being convenient for, the intensity that maintains coupling body 1 as far as possible does not receive the influence of mounting groove 2. As shown in fig. 2, when the spring plate 3 is fully pressed into the mounting groove 2, the rear end of the spring plate 3 is still inside the mounting groove 2 and does not extend out of the mounting groove 2, which helps to protect the spring plate 3.

Referring to fig. 1, in some possible embodiments, a straight section is disposed at the front end of the spring plate 3, a counter bore penetrating through the spring plate 3 along the thickness direction of the straight section is disposed on the straight section, and a countersunk screw 4 penetrates through the counter bore and is connected to the coupling body 1 for fixing the front end of the spring plate 3 in the mounting groove 2.

Specifically, as shown in fig. 1, there are two counter bores, and the two counter bores are arranged at intervals along the length direction of the spring plate 3 to enhance the connection strength.

Specifically, the spring piece 3 is a single bow-shaped spring piece 3, the single bow-shaped spring piece 3 is applied more in the centralizer, and the single bow-shaped spring piece 3 has a larger bow height to ensure larger elasticity.

Optionally, the spring piece 3 can also be a double-arch spring piece 3, the double-arch spring piece 3 has smaller arch height, but has the characteristic of rigidity, can have larger righting force change under the condition of smaller deformation, and is suitable for irregular boreholes, horizontal wells and the like.

In some possible embodiments, a circulation groove 5 is formed between two adjacent mounting grooves 2 and is parallel to the mounting grooves 2. Referring to fig. 4 and 5, the outer sidewall of the coupling body 1 is further provided with a circulation groove 5 penetrating from front to back, and the circulation groove 5 is located between two adjacent mounting grooves 2 and used for increasing the circulation area of the fluid in the wellbore. When the borehole internal diameter is less, the gap between coupling body 1 and the borehole inside wall is less, for the circulation effect of the fluid in the reinforcing borehole, seted up circulation groove 5 that link up around on the lateral wall of coupling body 1, circulation groove 5 has seted up a plurality ofly, and a plurality of circulation groove 5 evenly distributed are annular array on the lateral wall of coupling body 1.

Optionally, the circulation groove 5 is spaced apart from the mounting groove 2. Circulation groove 5 and mounting groove 2 all are provided with six, are equipped with a circulation groove 5 between every two adjacent mounting grooves 2, and the interval between two adjacent mounting grooves 2 and circulation groove 5 is equal.

Alternatively, the flow channel 5 is a rectangular channel.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Centralizing casing collar, comprising:

2. The centralizing casing collar of claim 1, wherein the mounting groove is a rectangular groove.

3. The centralizing casing collar of claim 2, wherein the depth of the mounting groove is greater than the thickness of the leaf spring.

4. The centralizing casing collar of claim 3, wherein the length of the mounting groove is greater than the length of the leaf spring.

5. The centralizing casing collar of claim 4, wherein the forward end of the mounting groove is located in the middle of the collar body.

6. The centralizing casing collar of claim 5, wherein the mounting groove extends to a back end face of the collar body.

7. The centralizing casing collar of claim 1, wherein the spring plate has a counterbore at its forward end, and a countersunk screw is disposed through the counterbore for positioning the spring plate in the mounting groove.

8. The centralizing casing coupling of claim 7, wherein the leaf spring is a single segment leaf spring.

9. The centralizing casing collar of claim 1, wherein a flow channel is defined between two adjacent mounting grooves and is disposed parallel to the mounting grooves.

10. The centralizing casing coupling of claim 9, wherein the flow channels are rectangular channels.